Mike Locken is freelance operative.
He was an agent with SYOPS, at least in the prologue. It certainly isn't every series that starts out with the hero leaving the Intelligence profession with a major disability, but that is what happens with the Michael Locken series.
Locken was a veteran agent for SYOPS, an American agency with an interesting mission. They were not spies or counterespionage agents; they were movers. If there was a person at Point A who needed to be a Point B and others wanted it stopped, it was SYOPS that was called. Making the job even more interesting was that sometimes the person wanted moved and sometimes they didn't. To SYOPS people, it didn't matter.
To Locken, however, it meant having to be extremely flexible and creative and able to adapt to each new assignment. An older, infirm subject is considerably different than a rebellious and physically active young adult. The type of people possibly after either would likely be different as well.
Locken was probably the best there was until a mistake by a junior agent lets in an assassin whose gun shots ends Locken's career and nearly his life. But it is just the start of the next stage in the life of a man who won't stay dead. Six months of recovery, a brace on his knee he must always wear, and an elbow that still doesn't work right, he didn't think he would have another life but he does and he is planning to make the most of it.
Unlike the cover blurbs which proclaim Locken as a CIA agent, he is for the length of the series, a free agent, hired by different agencies to handle exceptional jobs, especially when they do not want blame to come back on them in case of failure. Because of his injuries, a lot of the people he works with and against do not believe he is as good as he is. They are wrong. In many cases, they are dead wrong.